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New limits on cosmic strings from gravitational wave observation
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abstract
We combine new analysis of the stochastic gravitational wave background to be expected from cosmic strings with the latest pulsar timing array (PTA) limits to give an upper bound on the energy scale of the possible cosmic string network, $G\mu < 1.5\times 10^{-11}$ at the 95% confidence level. We also show bounds from LIGO and to be expected from LISA and BBO. Current estimates for the gravitational wave background from supermassive black hole binaries are at the level where a PTA detection is expected. But if PTAs do observe a background soon, it will be difficult in the short term to distinguish black holes from cosmic strings as the source, because the spectral indices from the two sources happen to be quite similar. If PTAs do not observe a background, then the limits on $G\mu$ will improve somewhat, but a string network with $G\mu$ substantially below $10^{-11}$ will produce gravitational waves primarily at frequencies too high for PTA observation, so significant further progress will depend on intermediate-frequency observatories such as LISA, DECIGO and BBO.
Forward citations
Cited by 7 Pith papers
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A "Neutrino Fog" For Gravitational Waves: The Stochastic Gravitational Wave Background from Supernova Neutrino Memory
Using 3D supernova simulations, the authors predict that neutrino memory creates a gravitational wave background with Omega_GW around 1e-16 at 0.1 Hz, within reach of future space-based detectors.
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Probing the gravitational wave background from cosmic strings with LISA
LISA is projected to probe cosmic string tensions G mu down to about 1e-17 and to measure spectral features from early-universe physics.
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Backreaction on an infinite helical cosmic string
For a small-amplitude helical breather cosmic string, gravitational backreaction produces energy loss matching Sakellariadou's power and a rotation of the generators that advances the oscillation phase.
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Cosmic string gravitational wave backgrounds at LISA: II. Reconstruction of conventional signals over astrophysical foregrounds
When realistic astrophysical foregrounds are included, LISA can reconstruct the cosmic-string tension to 10% precision only for Gμ ≳ 10^{-11}, 10^5 times larger than foreground-free forecasts.
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Cosmic string gravitational wave backgrounds at LISA: I. Signal survey, template reconstruction, and model comparison
As provided, the manuscript body (random lasing) does not correspond to the abstract (cosmic string gravitational wave backgrounds at LISA), leaving the abstract's quantitative claims unsupported by any accessible text.
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Gravitational waves from metastable cosmic strings in the delayed scaling scenario
Metastable cosmic strings with delayed scaling can explain the PTA gravitational wave background with tension up to Gmu ~ 3e-5 while evading LVK bounds, producing a plateau and an f^-1/3 tail detectable by future inte...
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Non-Standard Thermal History and Formation of Primordial Black Holes in Einstein-Gauss-Bonnet Gravity
A tuned Einstein-Gauss-Bonnet inflation model can create primordial black holes from asteroid-sized to tens of solar masses and secondary gravitational waves, with abundances that change dramatically in a stiff post-i...
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